Patent 7873248 was granted and assigned to Fujikura on January, 2011 by the United States Patent and Trademark Office.
A ferrule includes a recess formed on an obliquely polished surface to house a protrusion formed on an obliquely polished surface of another ferrule, so as to avoid an angular change at an interface between end surfaces of the pair of obliquely polished end surfaces of the ferrules facing each other.